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The Oracle Certification software is soundless essentially the most well-known certification among utter database carriers. here's no surprise due to the fact Oracle has dominated the marketplace for stupendous scale relational databases international. Oracle has absolutely revamped the DBA Certification song with the free up of the Oralce9i database. To most desirable remember the changes that the DBA music has undergone, it's gold measure to first assessment the Oracle8i DBA music.
To rotate into an Oracle8i certified professional (OCP) DBA, the certification candidate crucial to rush five exams:
Passing utter 5 assessments changed into a very challenging project, to assert the very least. the primary two checks within the track fill been regularly regarded to breathe among the hardest...as mastery of their content become elementary in passing checks 3 and 4. The network Administration exam turned into an entity of its own, containing content material a much deal diverse than the others...despite the fact extraordinarily essential for the DBA to operate his or her tasks.
With Oracle9i, the DBA Certification music is now divided into 2 simple tiers, as well as a 3rd master-degree tier:
The core Oracle9i DBA track includes 4 tests: 2 for OCA, and an further 2 for OCP.
Oracle9i licensed affiliate (OCA)
The OCA tier become designed to give for an entry-degree DBA certification designation for the Oracle9i platform. tips technology authorities with puny or no Oracle journey can gain the potential and skills fundamental to raze into the totally lucrative and difficult Oracle profession. The competencies got from completing this certification music will allow the candidate to heave portion on Oracle-linked initiatives acting as junior-level DBAs. customarily, a senior-stage DBA will labor closely to assign usurp DBA initiatives to enhance present knowledge, and problem them to breathe trained sortof greater superior procedures.
The Oracle9i certified associate (OCA) requires passing two tests:
Oracle9i licensed skilled (OCP)
The OCP tier became designed for mid to senior-degree DBAs with one or extra years of focused Oracle DBA adventure. The capabilities and abilities bought from completing this tier of the certification software attach together the DBA to supply the entire assortment of DBA-related initiatives...from Database Design and building to construction tasks corresponding to efficiency Tuning and Backup & restoration.
The Oracle9i licensed skilled (OCP) requires passing both checks within the OCA Tier, plus two extra exams:
note: it's too feasible to rotate into an Oracle9i licensed professional (OCP) by taking one exam: Oracle9i: original elements for administrators. To qualify to become an OCP by means of taking this one "improve" examination, you exigency to first breathe an Oracle8i certified skilled (OCP).
Oracle9i certified master (OCM)
there's a 3rd tier to the Oracle9i DBA Certification song, the OCM. This song is targeted at very senior degree DBAs and Oracle consultants. if in case you fill lower than 5 years of much Oracle labor event...and haven't spent many hours working with and testing advanced Oracle9i features...don't even accept as proper with this Tier as an choice. I carryout not imply to sound negative about this, however let me continue with extra on the necessities...and optimistically you are going to survey what I mean.
The OCM designation first requires that you acquire your Oracle9i OCP credential. once here is secured, Oracle requires that you heave two advanced Oracle lessons from Oracle university. These are teacher-led classes so as to charge on mediocre $2,000 every. There are a couple of dozen diverse courses to execute a option from:
when you've accomplished the direction requirements, you can then register for and heave the "practicum" examination. The practicum is a two-day, palms-on efficiency examination that requires the candidate to execute a couple of initiatives the usage of Oracle9i on the Linux platform. one of the crucial skills that should breathe confirmed encompass: database configuration, replication, partitioning, parallel operations, diagnostics, troubleshooting, performance tuning, and backup and healing...all with "precise-world" scenarios.
So, what's the problem with that you simply may additionally ask? First, the competencies you are going to deserve to comprehend and breathe able to execute are covered in many greater than just two of the superior lessons you'll breathe required to heave from Oracle university. So however you carryout heave both required classes, you'll should breathe trained and breathe prepared for a superb deal extra. This may require many months of extra self-analyze or many thousands of dollars in extra Oracle school courses. second, the cost of the practicum exam is an outrageous $2,000. You might not wish to fail and re-take (re-pay) for this examination!!
do not score me wrong, i fondness the concept of a master-stage Oracle certification, however the direction requirements and examination charge execute this Tier can charge-prohibitive for many.
continued in portion II.For more assistance
At MariaDB Corp's user and developer conference MariaDB OpenWorks in great apple's economic District, MariaDB CEO Michael Howard pulled no punches at his enterprise's opponents: great cloud, principally Amazon net features (AWS) and Oracle. Howard opened with announcing great proprietary cloud fill been "strip-mining open-supply technologies and organizations," he continued on the storm from there.
"These groups, he persisted, "You recognize they are -- are definitely abusing the license and privilege [of open source], via no longer giving back to the neighborhood." The MariaDB database management apparatus (DBMS), utter started as a MySQL fork. these days, with its heart nonetheless licensed beneath the GPLv2, Sanjeev Mohan, a Gartner analysis Director, called MariaDB "the gold ordinary for enterprise open-source DBMSs."
Howard persisted, "We faith proprietary and closed licenses are dead. They believe you exigency to breathe a standard-aim database and not a relegated niche one, fondness -- and nothing towards it -- time series. it is no longer going to breathe a universal goal database if you want to drive functions worldwide." MariaDB is any such database.
whilst MariaDB grows with the aid of leaps and bounds in trade computing at Oracle's price, Howard sees Oracle and Amazon fighting in opposition t it. "Oracle because the illustration of on-premise lock-in and Amazon being the illustration of cloud lock-in. You might interchange the names, which you could honestly remark now that Amazon should simply breathe known as Oracle prime."
Howard is rarely utter that worried about Oracle. they fill been competing against Oracle considering that day one. Ever on account that MariaDB built an Oracle compatibility layer, which includes Oracle Database facts types, sequences and PL/SQL syntax, into its MariaDB commercial enterprise Server final might also, MariaDB has been winning customers over from Oracle at an unparalleled price. With it, Howard mentioned, "Now, that you can migrate complicated operational Oracle programs to MariaDB. last year, they had one of the most largest banks -- building fiscal institution of Singapore -- on the planet forklift from Oracle to MariaDB" given that then, MariaDB has considered 5 instances the number of Oracle migrations happening over the ultimate year."
AWS, well, it really is an additional weigh number.must read
in the first keynote, Austin Rutherford, MariaDB's VP of customer Success, showed the result of a HammerDB benchmark on AWS EC2. HammerDB is the main enterprise DBMS benchmarking and load testing software. In these tests, AWS's default MariaDB circumstances did poorly, while AWS homebrew Aurora, which is developed on accurate of MySQL, at utter times beat them. The properly-performing DBMS of utter was MariaDB Managed functions on AWS.
AWS Aurora readily distances AWS's MariaDB instances, but the fastest of utter is MariaDB Managed capabilities.MariaDB
"My first reaction after I appeared at the benchmarks," spoke of Howard, turned into "might breathe there may breathe incompetence occurring. possibly they simply don't know the route to optimize a DBMS." He followed that one MariaDB customer, one of the biggest retail drug businesses on the planet, had informed MariaDB that "Amazon presents probably the most vanilla MariaDB around. there may breathe nothing trade about it. They may just install MariaDB from source on EC2 and carryout as well."
He than "begun to wonder, Is there anything that they're deliberately crippling?" Howard would not travel as far as to title AWS is consciously doing a terrible job of implementing its MariaDB cases. Howard did say, "after which it became transparent that, however, you want to articulate this, there's anything no longer kosher happening."
Howard does not fill lots against AWS advertising its own brands. "it truly is just merchandising. they may breathe welcome to carryout this. I don't suppose it breathe the correct constituent to do. appropriate. however i am no longer gonna i'm now not going to breathe really tremendous essential of that. Like, in case you travel birthright into a pharmacy, they frequently fill earnings on their personal endemic issues." but, if AWS's going out of its approach to execute a emulate service seem not so superb as its own, neatly, Howard's not satisfied about that.
Of direction, it's additionally rather workable that unoptimized widely wide-spread MariaDB illustration will with no peril lag at the back of AWS-optimized Aurora. That noted, even during this most blameless heave on the benchmark outcomes, cloud clients can breathe sensible to sustain in intellect that cloud situations of any selected utility carrier may additionally no longer breathe created equal.
also: Warren Buffett has offered his Oracle shares
searching forward, Oracle and Amazon regardless, Howard's bound MariaDB is coming out now not simply as a MySQL clone however as an stupendous company DBMS vigour. "We labor with the greatest agencies in the world. United airlines uses MariaDB for each ticket. MariaDB is working that airline. Forty p.c of Fortune 2000 companies already depend on MariaDB at a degree that the NoSQL can most effective dream of. For efficiency, Oracle and DB2 are their only rivals."
Aurora? Howard sneered, "The foremost Aurora can carryout in a failover is 12 seconds. MariaDB can carryout it below a 2nd."
From where Howard stands, if you are no longer using MariaDB yet -- notwithstanding your enterprise is tied to Oracle with licenses of metal -- you quickly might be. "MariaDB is the heir manifest to Oracle."connected reviews:
In-DepthOracle apparatus strategy: 10G alerts grid path
in the days ahead, that evolution will heave some original steps ahead. Oracle is getting ready to update some apparatus -- with more than a passing nod to its database methods roots -- to play more suitable in the emerging arena of Grid computing.
whereas Oracle-as-toolmaker is usually overshadowed via Oracle-as-database-maker, the Silicon Valley-primarily based hard is a major accommodate in the evolution world, and it has increasingly tried to develop its apparatus beyond database-centric design. Oracle has committed years and demanding components to its utility evolution items, and considers its apparatus company to breathe nothing lower than a using drive in the back of revenue of its different choices.
“To the extent to which they are able to score developers working with the Oracle platform, that’s first rate for their company as an entire,” said John Magee (left), vice chairman of software servers and apparatus in Oracle’s product advertising group.
“We invest a much deal in developers and construction tools beyond any revenue they might automatically generate. more peculiarly, they view developer productiveness as strategic to their long-term boom and desires as a company,” he stated. “where developers go, the mindshare of the platform goes, and that drives their revenues.”
Few observers question that Oracle’s existing apparatus approach is closely linked with its purposes and market-main database groups. because the trade has moved to create attainable middleware platforms in fresh years, the hyperlinks fill not at utter times been as tight as some would suspect, youngsters. in reality, builders complained that early types of Oracle’s Java construction product provided puny aid for building apps that would interact with the Oracle DB. it's a miles yell from when Oracle apparatus had been tied at the hip to its flagship database.
today, Oracle works fondness others to position its app servers and tools as competencies standalone offerings. fondness others, it seeks to ease the cross of Java evolution and to multiply commercial enterprise developer productivity.
The fashioned incarnation of the AppBuilder for Java utensil became spawned by supply code from Borland’s JBuilder, which Oracle licensed in 1997. using that source code as a groundwork, the company released version 1.0 of the device in 1998.
That early edition advanced drastically over several generations into an entire IDE, renamed JDeveloper. The three.0 release of the utensil brought trade components for Java, a J2EE framework designed to deliver design-time facilities and runtime features to simplify the assignment of constructing, debugging, customizing and reusing company accessories. The concept became to reduce the complexity of constructing trade apps by using giving builders constructed-in solutions for typical requirements. That intention of reducing the complexity of the software construction procedure would proceed to affect the evolution of the business’s flagship dev device.
In plunge 2001, Oracle added Oracle9i JDeveloper, a very rewritten and 100% unadulterated Java version of the product. Oracle would soon mingle the IDE and trade intelligence (BI) tools into a unique product bundle, dubbed the Oracle9i Developer Suite. The suite became designed to permit users to construct transactional apps that may well breathe deployed to numerous channels, including portals, internet capabilities and instant structures, and that could breathe extended with BI capabilities, corresponding to advert hoc query and evaluation, net reporting and superior analysis.
the original apparatus suite was certainly tailor-made for the three ordinary-primarily based technologies -- Java, XML and SQL -- Oracle considers elementary for supplying functions today. The product too embraced the increasingly regular suggestion that construction products should soundless supply for the total application building lifestyles cycle, combining apparatus for modeling, deployment, debugging, version control, dependency administration, fill an consequence on evaluation and efficiency profiling into a unique atmosphere. And it included collaborative building capabilities for dispensed undertaking groups.
Magee claims that, according to casual surveys on the Oracle expertise community internet website, greater than half of the app builders presently using JDeveloper are constructing apps for different systems. “That’s a departure from traits of the past couple of years, and they believe it’s the outcome of the emergence of requirements-based technologies,” he stated.
“nowadays, with Java we’ve entered the requisites-primarily based evolution market,” Magee referred to.
nonetheless, Oracle admits that its dev tools are most suitable with its own DB and app server. Its web website puts it this way: “while Oracle9iDS is designed to breathe open with back for the latest internet requisites -- including J2EE, XML, WSDL, cleaning soap, UML, WebDAV, XMI and SQL -- the suite works top of the line with the Oracle9i Database and with Oracle9i software Server. Oracle9iDS takes plenary competencies of the infrastructure offered by route of Oracle’s deployment servers to simplify deployment and database interaction.”
“people can -- and carryout -- expend their tools to construct apps for other structures,” Magee stated. “That’s adequate with us,” he quipped, “we’ll simply migrate them later.”
version 9.0.5 of the JDeveloper IDE, which previewed at the JavaOne display ultimate June, emphasized ease-of-use features, such because the original software construction Framework (ADF) that was designed for programmers lacking the excessive-stage competencies of techniques programmers. The circulation -- fondness moves with the aid of BEA, IBM, solar and others -- can too breathe seen as an try to simplify Java evolution so that better ranks of developers can labor in the Java house and, now not by the way, to offer a competitive option equivalent to Microsoft’s visible basic. along with the more refined points favorite by using advanced coders, the original edition generates low-stage infrastructure code for tying apps to databases and for passing information between consumer interfaces and enterprise objects.“originally, they thought they had really two several types of developers that they desired to serve -- coders with excessive-degree abilities and what they summon ‘company builders,’” mentioned Ted Farrell (left), architect and senior director of method for application evolution apparatus at Oracle. but attaining a consensus on the route to carry such “dual-functionality” become now not handy.
“JDeveloper has an extensible architecture, so they kicked across the theory of literally constructing and packaging two part tools,” spoke of Farrell. “essentially immediately, they institute ourselves in great arguments over which duty should soundless travel into which version of the device.
“Then they notion about developing a ‘vigor mode’ for the coders and a ‘fluff mode’ for the others,” he endured. “but they ran into the very complications. at last, they concluded that their assessment that there are just two styles of users was off. basically, there are probably lots of forms of users on a sliding scale of competencies and event.”
in line with the mannequin-View-Controller (MVC) architecture, the application construction Framework is designed to allow developers to seat of attention on the enterprise superb judgment rather than on the underlying applied sciences. It provides users who've a less-than-skilled command of J2EE with visible, declarative and guided coding points. developers exploit the application’s meta statistics the usage of visible equipment, whereas the framework executes the application in the most useful approach the usage of business-commonplace J2EE design patterns.
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The Oracle Certification Program continues to breathe the most common certification among utter database vendors. This is no surprise considering Oracle has dominated the market for great scale relational databases worldwide. Oracle has completely revamped the DBA Certification track with the release of the Oralce9i database. To best understand the modifications that the DBA track has undergone, it's best to first review the Oracle8i DBA track.
To become an Oracle8i Certified Professional (OCP) DBA, the certification candidate needed to pass five exams:
Passing utter five exams was a very challenging task, to remark the very least. The first two exams in the track were often considered to breathe among the toughest...as mastery of their content was essential in passing exams 3 and 4. The Network Administration exam was an entity of its own, containing content much different than the others...although extremely necessary for the DBA to execute his or her duties.
With Oracle9i, the DBA Certification track is now divided into 2 primary tiers, as well as a third Master-level tier:
The core Oracle9i DBA track consists of 4 exams: 2 for OCA, and an additional 2 for OCP.
Oracle9i Certified Associate (OCA)
The OCA tier was designed to provide for an entry-level DBA certification designation for the Oracle9i platform. Information Technology professionals with puny or no Oracle flavor can obtain the knowledge and skills necessary to wreck into the highly lucrative and challenging Oracle profession. The skills obtained from completing this certification track will allow the candidate to participate on Oracle-related projects acting as junior-level DBAs. Typically, a senior-level DBA will labor closely to assign usurp DBA tasks to strengthen existing skills, and challenge them to learn slightly more advanced procedures.
The Oracle9i Certified Associate (OCA) requires passing two exams:
Oracle9i Certified Professional (OCP)
The OCP tier was designed for mid to senior-level DBAs with one or more years of focused Oracle DBA experience. The knowledge and skills obtained from completing this tier of the certification program prepare the DBA to provide the plenary assortment of DBA-related tasks...from Database Design and evolution to production tasks such as Performance Tuning and Backup & Recovery.
The Oracle9i Certified Professional (OCP) requires passing the two exams in the OCA Tier, plus two additional exams:
Note: It is too workable to become an Oracle9i Certified Professional (OCP) by taking one exam: Oracle9i: original Features for Administrators. To qualify to become an OCP by taking this one "Upgrade" exam, you must first breathe an Oracle8i Certified Professional (OCP).
Oracle9i Certified Master (OCM)
There is a third tier to the Oracle9i DBA Certification Track, the OCM. This track is targeted at very senior flush DBAs and Oracle consultants. If you fill less than 5 years of solemn Oracle labor experience...and fill not spent many hours working with and testing advanced Oracle9i features...don't even reckon this Tier as an option. I don't intimate to sound negative about this, but let me continue with more on the requirements...and hopefully you'll survey what I mean.
The OCM designation first requires that you obtain your Oracle9i OCP credential. Once this is secured, Oracle requires that you heave two advanced Oracle courses from Oracle University. These are Instructor-led courses that will cost on mediocre $2,000 each. There are about a dozen different courses to choose from:
Once you've completed the course requirements, you can then register for and heave the "practicum" exam. The practicum is a two-day, hands-on performance exam that requires the candidate to execute a number of tasks using Oracle9i on the Linux platform. Some of the skills that exigency to breathe proven include: database configuration, replication, partitioning, parallel operations, diagnostics, troubleshooting, performance tuning, and backup and recovery...all with "real-world" scenarios.
So, what's the problem with that you may ask? First, the skills you'll exigency to know and breathe able to execute are covered in many more than just two of the advanced courses you'll breathe required to heave from Oracle University. So even if you carryout heave the two required courses, you'll exigency to learn and breathe prepared for much more. This could require many months of additional self-study or many thousands of dollars in additional Oracle University courses. Second, the cost of the practicum exam is an outrageous $2,000. You won't want to fail and re-take (re-pay) for this exam!!
Don't score me wrong, I fondness the belief of a Master-level Oracle certification, but the course requirements and exam cost execute this Tier cost-prohibitive for most.
Continued in portion II.For More Information
Get the basics of remote server access as well as how you can capitalize from this access today. You will flavor workable examples that will bring you to an immediate and practical understanding of remote server access.This chapter is from the engage
After reading this chapter, you will breathe able to understand:
For this book's purpose, there are two workable installation configurations: remote and local. A remote configuration uses your computer to access a remote server machine. A local configuration first determines whether you exigency to access a remote server machine.
You could breathe working locally, on a computer that has the Oracle database, application server, and client software utter installed on the very machine, or you could breathe working remotely, using your computer to access a remote server machine. If you fill installed Oracle9i Personal Edition on your computer, then you fill a local installation.
Understand that most real-world databases are housed on a server machine, which is accessed remotely by client machines. If you fill a remote configuration, fondness that often institute in a corporate training environment or an educational setting, then you should find the information in this chapter immediately applicable to your work. You may fill been granted access to a remote server machine on which you can complete the exercises in this book. In this case, check with the system administrator to survey if you fill access privileges needed to complete the exercises in this chapter. It is too workable that your company may fill a evolution configuration where the client, Web server, and database server are on one machine, isolated from the rest of the network. This ilk of configuration is illustrated as you labor through the exercises in this book.
The very holds proper for Web sites; the majority of Web sites are too housed on server machines (commonly referred to as simply servers), with a connection to the Internet. Web applications, such as the one you build in this book, fill many Web pages that are dynamically generated from database procedures, so there is not a much exigency to store static HTML files on a server. Yet image files can breathe stored inside the database or they can breathe stored on a Web server, as can any static HTML pages you wish to expend in your application. It depends on how your database is configured. Documents that require a plug-in to view, and any files of other types other than HTML or image that are used in the application, such as Adobe Acrobat files or Word documents that are intended to breathe downloaded, can breathe stored on the Web server or in the database. Chapter 13, "Images," illustrates the method for storing and retrieving documents from an Oracle 9i database.
If you carryout not fill access to a remote server machine, then advert to Chapter 2, "Oracle 9iAS," in which you learn that your local machine can breathe used as the server, the client, and the middleware necessary to complete the exercises in this book. remember that if you install an Oracle9i database on your own machine, the installation includes a basic Oracle 9iAS. You can store static HTML pages or images in your own computer's file directory, and configure the Oracle HTTP Server component of the Oracle 9iAS to find the files you want. This is done by identifying the directory where your images and HTML files are stored in the Oracle 9iAS, and giving that directory a virtual name, as explained in Chapter 2, "Oracle 9iAS."The Server
The server is a great file directory that you exigency to access in order to complete the exercises in this book. You store files there, such as HTML files or image files, that you wish to execute accessible to users on the Internet. You must map specific directories on the server machine to virtual directories in the 9iAS so that the correct directories can breathe accessed, depending on the URL (Uniform Resource Locator) the user supplies.
About 80% of databases are stored on machines that flee the UNIX operating system, and are familiarly known as "UNIX boxes." Since databases are too stored on machines running NT, many NT commands, where they differ from UNIX commands, are famed throughout this chapter.Telnet
Telnet is software that provides a user or developer a route to connect to a server machine. It is a terminal emulator, which means it gives users the ability to log in to a server machine and labor on it remotely. When a developer connects to a server via Telnet, the developer begins a Telnet "session" on the server. Telnet allows you to cross platforms, signification that if you are on a Windows PC, you can Telnet to a UNIX server and vice versa.
Most computers running Windows promote with a basic version of Telnet software installed. The quickest route to commence a Telnet session is to travel to the Start menu and choose "Run…." You are asked to "Type the cognomen of a program, folder, or document, and Windows opens it for you." ilk the word "telnet" and click OK. A window should pop up that has the word "Telnet" in the title bar.
Once you fill successfully invoked a Telnet session, the next step is to connect to a server. No matter what version of Telnet software you use, you must know three things ahead of time in order to breathe able to successfully connect to a remote server—the cognomen of the server, a login ID, and a password. If you are going to breathe connecting to a server and working there, chances are the system administrator knows that you are going to breathe doing this, and has provided you with the cognomen of the machine and a login ID and password. A sample server cognomen might breathe server4.virgil.com, where server4 is the cognomen of the machine on the virgil network. Some people prefer to summon a machine by its numeric IP address, such as 184.108.40.206.
The method you expend to connect to the server depends on the benevolent of Telnet software installed on your machine. If your Telnet window has a prompt, you can enter the words "open server4.virgil.com" to open a connection. If your version of Telnet does not fill a prompt, then peep on the menu bar for an particular called "Connect." This is probably the first particular on the menu bar. Click on Connect and you are provided with a plot to enter the server name. The host cognomen is another term for server name—the server you are connecting to hosts your guest connection.
You are then prompted for a login cognomen (ID) and password. Enter the login cognomen and password provided by your system administrator. Once you are connected, you should survey a $ prompt, or possibly a % or # prompt. This is sortof anticlimactic. However, breathe assured that you are connected. You may too survey a list of environment or user settings, or a short message of greeting that was configured by the system administrator.Basic UNIX Commands
Once you fill connected to the server, you exigency to know how to navigate around the directory structure of the server and exploit your files. You accomplish this using basic UNIX commands.
The first step in navigation is to know where you are. When a user logs in, the user will always commence from the very initial directory, called the home directory. This home directory is determined when a user account is created by the system administrator, and is included in the configuration for each user who will breathe accessing the server. Different users are usually assigned different home directories. In order to find out which directory you are presently in, ilk the UNIX command pwd. This will print your present working directory. You survey different values for pwd as you travel through the file system. In NT, your prompt is always inclusive of the present working directory.
To survey a list of utter of the contents of the present directory, ilk ls and enter. The names of utter of the files and subdirectories in the current directory will breathe listed. To obtain a list with more details, ilk ls -l and press the Enter key. The -l after the ls is called an argument. Supplying arguments after UNIX commands is a route to supply more specifics about what you want the UNIX command to accomplish. Arguments are listed after the command, and the syntax is a minus sign followed by one or more letters that bespeak what options you'd like. The -l is a telling controversy for the ls command, which tells the server to display a longer description of each file and subdirectory.
As you navigate through directories, pwd and ls -l (or simply reading the prompt itself and typing dir in NT) will probably breathe the commands you expend most often, to find out where you are and what is in the directory where you are.
If the ls -l command returns more file and directory names than appropriate on the screen, enter ls -l | more instead. The screen fills one page, so to speak, with data, and then UNIX waits for you to press a key before displaying another screen page of data. The very is accomplished in NT by including /p after the command, to bespeak that the computer should suspension and wait for a key to breathe pressed before displaying more information.
Take a peep at the results from ls -l in more detail. Here is some sample output from running the ls -l command in UNIX:-rw-r--r-- 1 bobo devel 118253 Jul 17 12:05 1stlog1.wav drwxr-xr-x 2 bobo devel 4096 Nov 14 18:30 gfx -rw-r--r-- 1 bobo devel 1036 Nov 14 19:04 index.html -rw-r--r-- 1 bobo devel 973 Nov 14 18:32 index_old.html -rw-r--r-- 1 bobo devel 17451 Sep 5 00:35 syllabus.html -rw-r----- 1 bobo devel 0 May 24 2001 test.htm
The first column shows the file permissions, which are discussed in more detail later. Note that the first character is either a "d" or a dash. You could too survey an "l" here (indicating a symbolic link). A "d" in the first spot indicates a directory. The second column (denoted here by a list of numbers) shows the number of links to a file. The third column shows the owner of this file or directory; in this case, the owner is bobo. The owner is the user who has control over the file. The fourth column shows the group that the user bobo belongs to; in this case, devel. The fifth column shows the size of the file in bytes. The sixth column shows the date and time the file was created or last changed. Finally, the cognomen of the file is displayed in the seventh column.
One of the most necessary columns to pay attention to when developing Web applications or documents is the first column. It indicates what permissions its owner has granted on the file. These permissions are powerful; they determine how much access users can fill to each file, and what users can carryout with each file. Through permissions, files are made accessible on the Internet, or blocked from being accessible on the Internet, so it is necessary to understand and check file permissions, and to apply them carefully.Table 3.1. File Permissions Permission Character Number Equivalent read r 4 write w 2 execute x 1 none - 0 (Note that a hyphen symbol, "-", is the character displayed when notone of the other three permissions is granted for a file.)
There are three types of file permissions that can breathe granted on a file or directory. Table 3.1 outlines these three types. Though "none" is listed in Table 3.1 in the "Permission" column, it is not a license type, per se. Rather, it is the option available to you if you carryout not choose to enter one of the other three.
There are four levels of users when granting permissions, however. These four levels are outlined in Table 3.2.
Listed in Table 3.3 are some examples of different types of granted permissions. heave a peep at the permissions listings in the left column. After the first character, which indicates whether the current file is actually a directory or just a file, the other nine characters bespeak the permissions for each ilk of user. The second, third, and fourth characters display permissions at the user level. The next three characters display permissions at the group level, and the last three characters denote permissions for everyone else, the other level. These last three characters govern whether the public can read, write, or execute a file. These permissions examples provide a description of what each set of permissions permits, and to whom.Table 3.2. Levels of Users Level Letter Who is This user u The owner of the file, not just any user group g A group of users—users can breathe associated with groups by the system administrator other o Anyone who is not already included in either of the first two levels all a All users Table 3.3. Examples of File Permissions Sample Permissions Access -rwxrwxrwx The user, group, and everyone else can read, write, and execute -rwxr-xr-x Only the owner can read, write, and execute. Everyone else can only read and execute. -rwxrwx-- Only the owner and group can read and execute.
Remember that file permissions determine whether a file is accessible to the public on the Web. In the examples above, the public would breathe able to access files with the first two license sets, but not the third set of permissions. The first file would too breathe writeable, that is, updateable, by the public.
Always check file permissions to execute confident that they are correct for each file. Files that are not intended for public access on the Web should not breathe made accessible to the public. When it is time to "publish" a file, the permissions for utter users must breathe changed to allow others to view the file.
Each set of permissions has a three-digit numeric equivalent. For example, the permissions -rwxr-xr-x are too known as 755. How is this determined? Each digit corresponds to one of the three levels of permissions; the three digits bespeak the permissions for the user, group, and other levels, respectively. The number for each flush is arrived at by adding the numeric equivalents for each level. As listed above, each permission—read, write, and execute—has a numeric equivalent. These numbers are added to arrive at each digit. In 755, the 7 in the user slot means the user can read (4), write (2), and execute (1) the file; 4 + 2 + 1 = 7 and 7 is used. The second slot has the value 5, signification that at the group level, only read (4) and execute (1) permissions fill been granted; 4 + 1 = 5, so 5 is used. The third digit is too 5, signification that the permissions at the "other" flush are the very as they are at the group level; everyone else has the ability to read (4) and execute (1), and 4 + 1 = 5, so 5 is used again.
The UNIX command to change a file's permissions, or "change mode," is chmod.
The 755 indicates what the file permissions should breathe for the file "myfile". A 755 is a common option for a file that is intended to breathe accessed by the public, since it prevents anyone but the owner from updating the file, while allowing everyone else to access it.
Be extremely heedful not to execute files accessible that should not be. To remove access from a level, expend a zero (0) for the corresponding digit. This illustration gives plenary rights on the file to the owner, but revokes access from everyone else:chmod 700 myfile
NT users, note that you may change permissions on your files using basic Windows Explorer functionality.Basic Navigation
Now that you know how to determine which directory you are in and what its contents are, how can you navigate? The cd command lets you change directories in both UNIX and NT. Table 3.4 lists some basic navigation commands you can expend for piteous up and down in a directory tree.
Table 3.5 lists some additional commands you can expend in a Telnet session on the server to manage your files.
The cp, or copy, command is particularly useful for making backup copies of documents before changing them or creating original versions of them. The convention is to sustain the very cognomen for the file, but append to the cognomen the date that you are changing the file. If you are creating a backup file for myfile on March 1, 2002, you might create a copy called myfile20020301.Table 3.4. Basic Navigation Commands Command Description cd directoryname Navigates downward in the directory tree to the subdirectory "directoryname." If you are unable to budge to that directory, expend ls -l to survey if you are using a telling subdirectory name. cd .. Navigates upward one flush in the directory tree. cd cd without anything after it takes you to your own home directory (NOTE: In NT, entering this command by itself will simply print your current working directory onto the screen.) cd /mydirectory The forward slash means you want to skip to the highest flush in the directory tree, start from there, and travel to the subdirectory "mydirectory." This is the equivalent of typing cd .. repeatedly until you are at the topmost directory, and then typing cd mydirectory. Table 3.5. Additional Commands for File Management and Manipulation Command Example Description rm myfile Deletes or removes the file called "myfile." rm –i Prompts the user before the system deletes the file (as a safety measure). mkdir mydirectory Creates a directory called "mydirectory." rmdir mydirectory Deletes or removes the directory called "mydirectory." cp myfile mynewfile Copies the file "myfile"; the copy is called "mynewfile" and is located in the very directory as the original "myfile" file. cp myfile /home/app/mynewfile Copies the file "myfile"; the copy is called "mynewfile" and is located in the /home/app/ directory. The cp command can copy files to another directory. mv myfile mynewfile Moves the file, or renames it. In this example, the file will breathe moved from its present location under the cognomen "myfile" to the very directory under the cognomen "mynewfile." This effectively renames the file. This is the route to rename a file in UNIX. mv myfile /home/app/ Moves the file "myfile" to the directory /home/app/. In piteous the file, it is not too renamed, because no original cognomen was specified. Absolute vs. Relative Path and Filenames
A plenary pathname, a pathname starting at the root or topmost directory, is too known as the absolute pathname. The pathname starting from where you are currently, wherever that may be, is known as the relative pathname. reckon the following directory structure as an example. classnotes is the topmost directory. homework is a subdirectory of classnotes, and homework_one is a subdirectory of homework.Docroot> classnotes homework homework_one Absolute Paths
An absolute path contains the complete URL (Uniform Resource Locator) for a file. A URL typically consists of four parts: the protocol, the server/domain, the path directory, any subdirectories, and finally, the actual file cognomen itself. An illustration of an absolute path listing is http://www.server4.virgil.edu/classnotes/homework/homework_one/hw1Answers.htm.
An absolute path is the very as the path in the address window of a browser (this address window is too referred to as a location). Absolute paths are fine for linking to files outside of your Web site. However, using the absolute path to link to other files within your Web site has disadvantages.
Say that a Web site uses absolute paths for utter of its links and images. This prevents the Web site from being portable. The result is the site's files cannot breathe moved to another server without having to change each and every file path to reflect the original address. This really becomes an issue if there are different environments. A typical network infrastructure has multiple environments, each on its own server machine. These include:
Using absolute paths requires that the links breathe changed each time the site is moved to the next environment on the next machine. How can you avoid this and at the very time execute a Web site portable? The reply is to expend relative paths.Relative Paths
It's preferable to expend relative pathnames when linking to documents within your own Web site. There are two types of relative paths: root-relative paths and document-relative paths.
A relative path uses as its starting point either (1) the Web site's docroot, or (2) the location of the page that holds the relative path. Using this starting point, the browser is able to find a file.Root-Relative Paths
A root-relative path always starts with '/' (a forward slash) and does not comprehend the protocol and domain names. The starting point is the Web server's docroot based on the current document.
In this illustration the search begins in the docroot of the Web server on which the current page resides, or www.server4.virgil.edu. To reference the file, hw1Answers.htm, simply start at the topmost directory and drill down to the directory where the file resides.Document-Relative Paths
A document-relative path does not commence with '/' (a forward slash) and, fondness a root-relative path, does not comprehend the protocol and domain. The starting point is the current document displayed in the browser. Thus, these paths are relative to the document.
To reference a file in the very directory as the current browser document, just reference the cognomen of the file:
To reference a file located in a directory below the current page, reference the subdirectory and file:
To reference a file located in a directory above the current page, ilk in two sequential periods, "..". If the current document is located in the directory "homework_one" and you want to reference a document in "homework", then the path would breathe written fondness this:
Add an extra set of ".." for each directory that you exigency to travel up. For example, to reference a file located two directories up from the current document, you could write the following:
In this case, navigating two directories up from the "homework_one" directory puts you in the "classnotes" directory.Root-Relative versus Document-Relative Paths
Now that you understand that a relative path is preferable to an absolute path for linking to files within your Web site, which ilk of relative path should you use: root-relative or document-relative paths?
It depends. Both give you the desired portability. If a site has an images directory that will not breathe moved, then a root-relative path is preferable for such a directory since the path to the images contained in it will always breathe telling regardless if the Web document (that references this directory) itself is moved to another directory. Document-relative paths, however, tend to breathe shorter, and may breathe preferable for that reason alone. Both types of relative paths can become invalid if a file is moved. So, the option of whether to expend root-relative or document-relative paths depends on the particular Web site and Web developer.Transferring Files via FTP
There are two options for delivering static files with Oracle 9iAS. You can store the files in the database or you can deliver them using the Apache Web server component. In the latter case, you are delivering, or serving, files from the file system of the server. When you fill files that you want to execute accessible on the Web, you must plot them on the server. Files can breathe transferred to a remote server using FTP. FTP stands for File Transfer Protocol, which is an apt description of what it does.
You too expend FTP to retrieve files for editing. This engage does not contend how to edit files directly on the server, since the editing tools available within the UNIX and NT environments (save for the book's discussion concerning Notepad) are outside the scope of this book. However, it is just as effective to transfer files from a server to a local machine, edit the files locally using Notepad or another simple text editor, and then transfer the edited file back to the server; in fact, there are developers who prefer to labor this way.
To expend FTP, you exigency the very three pieces of information you exigency when connecting to the server: the server name, a login ID, and a password for that machine.
You too exigency to know what ilk of transfer you want to accomplish. There are two modes for transferring files: binary and ASCII. The ilk of the file being transferred determines which mode should breathe used. ASCII is used strictly for simple text files only, such as files you open and read in Notepad without affecting the content. utter other files, including word processing documents, images, and .pdf files, must breathe transferred in binary mode. If you are not certain what ilk of file you have, try opening it in Notepad and survey if the content is displayed correctly. If not, expend binary mode.
You expend text commands to transfer files via FTP. breathe alert that products exist that offer a graphical interface for using FTP, such as WS_FTP and Hummingbird. These can breathe easier to expend if you find yourself transferring great numbers of files often.
To transfer files, you must first access a "command-line prompt" in MS-DOS. travel to the Start menu and choose "Run…" off the menu popup. ilk cmd or command in the space provided and click OK. A window should pop up with a prompt such as C:\WINDOWS>.
The FTP utility can connect a Windows PC to a UNIX server, or a Windows PC to a Windows server. The illustration used here illustrates a Windows PC connection to a UNIX server. At the prompt, ilk ftp followed by the cognomen of the server you wish to access.
FOR EXAMPLEC:\WINDOWS> ftp server4.virgil.edu
You will breathe prompted to supply your user cognomen and password. If successful, you survey an ftp> prompt. To view a list of ftp commands available at this prompt, ilk aid followed by the Enter key. To view aid for a specific command, such as put, ilk aid followed by the command, such as aid put.
The pwd, ls, and cd commands introduced earlier in this chapter are too available at the ftp> prompt, so expend them to navigate to the directory where the file should breathe placed. breathe confident you are in the directory where you want to plot the document before you proceed.
Set the transfer mode that you want, using either of the two commands, binary or ascii. Below is an illustration of switching to binary, and then to ASCII mode.
To transfer the file, expend the attach command and the path and filename for the file you are transferring. If you stored a file in C:\TEMP\DOCUMENTS called NEWPAGE.HTM, and you want to transfer it, you enter the following:ftp> attach c:\temp\documents\newpage.htm
Following are sample messages received after issuing the attach command:200 PORT command successful. 150 Opening ASCII mode data connection for NEWPAGE.HTM. 226 Transfer complete. ftp: 83 bytes sent in 0.6Seconds 1.38Kbytes/sec. ftp>
You can too retrieve a file from the server to labor with locally. To accomplish this you expend the score command:ftp> score myserverfile.htm
The myserverfile.htm file is retrieved, and placed in the directory on your file system that you started from when you issued the ftp command.
If you wish to transfer many files at once, you can expend different versions of the score and attach commands: mget and mput. Since these are commands for many files, instead of specifying one file, expend the asterisk (*) as a "wildcard" character. Using *.* indicates that utter files should breathe transferred. Here is an illustration of mput that will attach utter files with the extension .htm on the server:ftp>mput c:\temp\documents\*.htm
Here is the command with sample output. Note that there are two files, apple.htm and orange.htm, and that the ftp program prompts the user to supply a "y" or an "n" for each file before transferring it. The first file is confirmed for transfer while the second is not:ftp>mput c:\temp\documents\*.htm mput c:\temp\documents\apple.htm? y 200 PORT command successful. 150 Opening ASCII mode data connection for orange.htm 226 Transfer complete. ftp: 7330 bytes sent in 0.6Seconds 1.38Kbytes/sec. mput c:\temp\documents\orange.htm? n ftp>
The mget command makes similar expend of the asterisk as a wildcard character. Here is a sample of the mget command that retrieves utter types of files from the server that commence with an "a":ftp>mget a*.* 200 ilk set to A. mget apple.htm? y 200 PORT command successful. 150 Opening ASCII mode data connection for apple.htm(11 bytes). 226 Transfer complete. ftp: 7330 bytes sent in 0.6Seconds 1.38Kbytes/sec. mget artichoke.pdf? n ftp>
Keep in intellect whether the current transfer ilk is binary or ASCII. In the mget example, the transfer ilk was set to A or ASCII. The second file to breathe transferred was artichoke.pdf, which is not a simple text file. If the file had been retrieved from the server in ASCII mode, the resulting local file would fill been unreadable. It would fill to breathe transferred a second time, with the transfer mode set to binary. breathe mindful of the transfer mode whenever you are transferring files. It is particularly easy to overlook the transfer ilk when working with multiple files, so the route the ftp program prompts the user to substantiate transfer of each individual file is extremely helpful here.
Finally, to discontinue the FTP session, ilk quit or bye and press the Enter key.
Once your files are transferred to the server, remember to connect to the server using Telnet, and check the permissions on the files, changing the permissions as necessary.
In-DepthOracle tools strategy: 10G signals grid direction
In the days ahead, that evolution will heave some original steps forward. Oracle is preparing to update some tools -- with more than a passing nod to its database systems roots -- to play better in the emerging arena of Grid computing.
While Oracle-as-toolmaker is usually overshadowed by Oracle-as-database-maker, the Silicon Valley-based hard is a major accommodate in the evolution world, and it has increasingly tried to broaden its tools beyond database-centric design. Oracle has committed years and significant resources to its software evolution products, and considers its tools trade to breathe nothing less than a driving accommodate behind sales of its other offerings.
“To the extent to which they can score developers working with the Oracle platform, that’s superb for their trade as a whole,” said John Magee (left), vice president of application servers and tools in Oracle’s product marketing group.
“We invest a lot in developers and evolution tools beyond any revenue they might immediately generate. More specifically, they view developer productivity as strategic to their long-term growth and goals as a company,” he said. “Where developers go, the mindshare of the platform goes, and that drives their revenues.”
Few observers question that Oracle’s current tools strategy is closely linked with its applications and market-leading database businesses. As the company has moved to create viable middleware platforms in recent years, the links fill not always been as tight as some would suspect, however. In fact, developers complained that early versions of Oracle’s Java evolution product provided puny back for building apps that would interact with the Oracle DB. That is a far yell from when Oracle tools were tied at the hip to its flagship database.
Today, Oracle works fondness others to position its app servers and tools as potential standalone offerings. fondness others, it seeks to ease the cross of Java evolution and to multiply enterprise developer productivity.
The original incarnation of the AppBuilder for Java utensil was spawned by source code from Borland’s JBuilder, which Oracle licensed in 1997. Using that source code as a foundation, the hard released Version 1.0 of the utensil in 1998.
That early version evolved significantly over several generations into a complete IDE, renamed JDeveloper. The 3.0 release of the utensil introduced trade Components for Java, a J2EE framework designed to provide design-time facilities and runtime services to simplify the assignment of building, debugging, customizing and reusing trade components. The belief was to reduce the complexity of building enterprise apps by giving developers built-in solutions for common requirements. That goal of reducing the complexity of the software evolution process would continue to influence the evolution of the company’s flagship dev tool.
In plunge 2001, Oracle introduced Oracle9i JDeveloper, a completely rewritten and 100% unadulterated Java version of the product. Oracle would soon combine the IDE and trade intelligence (BI) tools into a unique product bundle, dubbed the Oracle9i Developer Suite. The suite was designed to allow users to build transactional apps that could breathe deployed to multiple channels, including portals, Web services and wireless platforms, and that could breathe extended with BI capabilities, such as ad hoc query and analysis, Web reporting and advanced analysis.
The original tools suite was specially tailored for the three standard-based technologies -- Java, XML and SQL -- Oracle considers essential for delivering applications today. The product too embraced the increasingly common notion that evolution products should provide for the entire software evolution life cycle, combining tools for modeling, deployment, debugging, version control, dependency management, repercussion analysis and performance profiling into a unique environment. And it included collaborative evolution capabilities for distributed project teams.
Magee claims that, based on informal surveys on the Oracle Technology Network Web site, more than half of the app developers currently using JDeveloper are building apps for other platforms. “That’s a departure from trends of the past couple of years, and they believe it’s the result of the emergence of standards-based technologies,” he said.
“Today, with Java we’ve entered the standards-based evolution market,” Magee noted.
Still, Oracle admits that its dev tools are most compatible with its own DB and app server. Its Web site puts it this way: “While Oracle9iDS is designed to breathe open with back for the latest Internet standards -- including J2EE, XML, WSDL, SOAP, UML, WebDAV, XMI and SQL -- the suite works best with the Oracle9i Database and with Oracle9i Application Server. Oracle9iDS takes plenary handicap of the infrastructure offered by Oracle’s deployment servers to simplify deployment and database interaction.”
“People can -- and carryout -- expend their tools to build apps for other platforms,” Magee said. “That’s OK with us,” he quipped, “we’ll just migrate them later.”
Version 9.0.5 of the JDeveloper IDE, which previewed at the JavaOne display last June, emphasized ease-of-use features, such as the original Application evolution Framework (ADF) that was designed for programmers lacking the high-level skills of systems programmers. The budge -- fondness moves by BEA, IBM, Sun and others -- can breathe viewed as an attempt to simplify Java evolution so that larger ranks of developers can labor in the Java space and, not incidentally, to offer a competitive alternative akin to Microsoft’s Visual Basic. Along with the more sophisticated features preferred by advanced coders, the original version generates low-level infrastructure code for tying apps to databases and for passing data between user interfaces and trade objects.“At first, they thought they had basically two different types of developers that they wanted to serve -- coders with high-level skills and what they summon ‘business developers,’” said Ted Farrell (left), architect and senior director of strategy for application evolution tools at Oracle. But reaching a consensus on how to deliver such “dual-functionality” was not easy.
“JDeveloper has an extensible architecture, so they kicked around the belief of literally building and packaging two part tools,” said Farrell. “Almost instantly, they institute ourselves in huge arguments over which feature should travel into which version of the tool.
“Then they thought about developing a ‘power mode’ for the coders and a ‘fluff mode’ for the others,” he continued. “But they ran into the very problems. Finally, they concluded that their assessment that there are just two types of users was off. In fact, there are probably thousands of types of users on a sliding scale of skills and experience.”
Based on the Model-View-Controller (MVC) architecture, the Application evolution Framework is designed to allow developers to focus on the trade logic rather than on the underlying technologies. It provides users who fill a less-than-expert command of J2EE with visual, declarative and guided coding features. Developers exploit the application’s meta data using visual tools, while the framework executes the application in the most efficient route using industry-standard J2EE design patterns.
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